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Allen-Bradley 20G1F3C920LNANNNNN PowerFlex 755 AC Drive

1. Product Introduction

The Allen-Bradley 20G1F3C920LNANNNNN is a high-power industrial AC variable frequency drive from the PowerFlex 755 series.

It is designed for large three-phase motor applications where high current capacity, reliable speed control, controlled acceleration and deceleration, process flexibility, and integration with industrial automation systems are required.

This model belongs to the high-power end of the PowerFlex 755 family. The 920 A configuration is associated with a 400 V AC input class, Frame 9, and a 500 kW normal-duty rating. The same rating family provides different motor-power limits depending on whether the application is classified as light duty, normal duty, or heavy duty. 

The catalog number 20G1F3C920LNANNNNN is also identified in product listings as an air-cooled 755 AC packaged drive. Closely related 920 A configurations include variants with different suffixes and option combinations, which means the complete catalog number should always be checked when selecting a replacement or alternative. 

The drive is intended for large industrial machinery rather than small machine applications. Typical uses include large conveyors, pumps, fans, blowers, compressors, material-handling systems, mining machinery, cement equipment, process equipment, and other high-power rotating machinery.

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2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product Family	PowerFlex
Product Series	PowerFlex 755
Product Type	High-power AC variable frequency drive
Catalog Number	20G1F3C920LNANNNNN
Drive Description	Air-Cooled 755 AC Packaged Drive
Input Voltage Class	400 V AC
Input Phase	Three-phase
Current Class	920 A
Frame	Frame 9
Cooling	Air cooled
Installation	Large industrial / floor-mounted configuration
Motor Control	Programmable AC motor control
Application Class	High-power industrial motor control
Product Architecture	PowerFlex 755

The 20G1F3C920LNANNNNN is listed among the PowerFlex 755 air-cooled packaged-drive configurations. Related catalog numbers include 20G1F3C920LNDNNNNN, 20G1F3C920KNANNNNN, 20G1F3C920MNDNNNNN and other option-specific versions. 

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3. Basic Product Parameters

Parameter	Specification
Model	20G1F3C920LNANNNNN
Brand	Allen-Bradley
Series	PowerFlex 755
Product Type	AC Variable Frequency Drive
Drive Configuration	Air-cooled packaged drive
Input Voltage	400 V AC class
Input Phase	3-phase
Current Rating	920 A
Frame Size	Frame 9
Cooling Method	Air cooled
Normal-Duty Power	Approx. 500 kW
Light-Duty Power	Approx. 560 kW
Heavy-Duty Power	Approx. 400 kW
Output	Variable-frequency three-phase AC
Motor Control	Programmable
Acceleration	Programmable
Deceleration	Programmable
Speed Control	Programmable
Torque Control	Application/control-mode dependent
Feedback	Configuration dependent
Communication	Configuration dependent
HIM	Configuration dependent
Braking	Configuration dependent
Enclosure	Configuration dependent
Dimensions	Configuration dependent; Frame 9 mechanical drawing should be used
Weight (kg)	Configuration dependent; exact packaged-drive data should be confirmed

The 920 A 400 V configuration is listed at approximately 560 kW light duty, 500 kW normal duty, and 400 kW heavy duty, with Frame 9 required for the 920 A configuration in the applicable PowerFlex rating tables. 

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4. Electrical Specifications

Electrical Parameter	Specification
Model	20G1F3C920LNANNNNN
Input Voltage	400 V AC class
Input Phase	Three-phase
Nominal Frequency	50 Hz typical
Output Voltage	Variable AC
Output Frequency	Variable / programmable
Current Class	920 A
Light-Duty Rating	Approx. 560 kW
Normal-Duty Rating	Approx. 500 kW
Heavy-Duty Rating	Approx. 400 kW
Frame	9
Cooling	Air cooled
Motor Speed Control	Yes
Acceleration Control	Yes
Deceleration Control	Yes
Current Limiting	Available through drive control
Torque Control	Available according to selected control mode
DC Bus	Integrated drive architecture
Grounding	Must follow installation requirements
Motor Cable	Application dependent
Input Protection	Application dependent
Line-Side Equipment	Application dependent
Harmonic Management	Application dependent

The 920 A rating places this model above the 770 A and 750 A configurations in the same 400 V PowerFlex family. The published rating tables show the progression from 770 A / 400 kW normal duty to 920 A / 500 kW normal duty, with the 920 A version moving into Frame 9. 

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5. Duty Ratings

The duty rating is one of the most important specifications when selecting this drive.

A high-power VFD can have different motor-power ratings depending on how much overload the application requires.

Duty Classification	Approximate Power Rating	Current Class	Typical Application
Light Duty	560 kW	920 A	Fans, pumps and moderate-overload applications
Normal Duty	500 kW	920 A	General high-power industrial machinery
Heavy Duty	400 kW	920 A	High-load or high-overload applications

The difference between these ratings is significant.

A 500 kW motor, for example, should not automatically be treated as a suitable application simply because the drive has a 920 A rating.

The actual load profile, acceleration requirement, overload duration, ambient temperature, carrier frequency, motor current, and application duty must all be checked.

For a heavy-duty application, the applicable heavy-duty rating is the important value rather than the higher light-duty rating.

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6. PowerFlex 755 Series Characteristics

The PowerFlex 755 platform is intended for industrial motor-control applications that require more than basic variable-speed operation.

It can form part of an integrated automation system and can be configured to handle speed control, torque-related functions, acceleration and deceleration, fault handling, feedback, communication, and process coordination.

This makes it suitable for machines where the motor is directly involved in the production process.

A large conveyor, for example, may need controlled acceleration to protect mechanical components.

A pump may need speed adjustment according to process demand.

A fan may need to respond to ventilation requirements.

A large material-handling machine may need carefully controlled acceleration and stopping.

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7. Product Construction

The 20G1F3C920LNANNNNN is a large-frame industrial drive.

The Frame 9 architecture provides the physical space needed for high-power electrical components, power semiconductors, DC-bus components, cooling assemblies, control electronics, terminals, and other equipment required for operation at this current level.

Because of the high electrical power involved, thermal management becomes an important part of the installation.

The drive should have adequate airflow and sufficient clearance for cooling and maintenance.

The electrical room or cabinet arrangement should also prevent hot exhaust air from being recirculated back into the drive’s cooling intake.

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8. Frame 9 Configuration

The 920 A rating is associated with Frame 9 in the PowerFlex 755 rating structure.

This is an important difference when comparing the model with lower-current Frame 8 versions.

Feature	920 A Configuration
Current	920 A
Voltage Class	400 V AC
Frame	Frame 9
Normal Duty	Approx. 500 kW
Heavy Duty	Approx. 400 kW
Light Duty	Approx. 560 kW
Cooling	Air cooled
Physical Size	Large
Installation	Industrial floor/cabinet arrangement
Service Access	Important
Lifting Requirement	Mechanical handling may be required

The Frame 9 designation should be considered during both electrical and mechanical design because the physical installation requirements are different from smaller Frame 8 drives. 

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9. Dimensions and Weight

For a drive of this size, dimensions and weight should be taken from the exact mechanical documentation for the complete catalog configuration.

The catalog number identifies a particular electrical and option configuration, but packaged-drive construction can include different enclosure, control, filtering, braking, and other arrangements.

For this reason, it would be inappropriate to use a generic Frame 8 dimension for this Frame 9 model.

Mechanical Parameter	Specification
Model	20G1F3C920LNANNNNN
Frame	Frame 9
Mounting	Large industrial / floor-standing configuration
Cooling	Air cooled
Height	Configuration dependent
Width	Configuration dependent
Depth	Configuration dependent
Overall Dimensions	Configuration dependent
Dimensions H × W × D	Verify exact mechanical drawing
Net Weight	Configuration dependent
Weight (kg)	Verify exact packaged-drive mechanical data
Shipping Weight	Configuration dependent
Floor Loading	Must be evaluated during installation
Service Clearance	Must follow installation requirements
Lifting	Mechanical lifting equipment may be required

For a replacement project, the exact dimensions should be checked before removing the existing drive.

Particular attention should be paid to cabinet height, width, depth, cable-entry area, door clearance, cooling airflow, service access, lifting points, and floor loading.

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10. Cooling System

The 20G1F3C920LNANNNNN is an air-cooled high-power drive configuration.

At 920 A, thermal management is not a minor detail.

The drive produces heat as a result of power-conversion losses, and the cooling system must continuously remove that heat.

Important installation factors include:

• Ambient temperature
• Cooling-air temperature
• Airflow
• Fan operation
• Cabinet ventilation
• Filter condition
• Dust accumulation
• Altitude
• Drive loading
• Carrier frequency
• Installation clearance

A dusty industrial environment can require more frequent inspection and cleaning than a clean electrical room.

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11. Main Applications

11.1 Large Conveyor Systems

Large conveyors are one of the most suitable applications for a drive in the 920 A class.

Typical installations include:

• Mining conveyors
• Coal conveyors
• Ore conveyors
• Cement conveyors
• Aggregate conveyors
• Port conveyors
• Bulk-material handling
• Large factory conveyors

Large conveyors can have very high inertia and substantial starting loads.

Controlled acceleration can reduce the mechanical shock transmitted to belts, gearboxes, shafts, couplings, bearings, and supporting structures.

Controlled stopping can also improve the overall behavior of the conveyor.

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12. Mining Applications

Mining operations frequently use high-power motors for material transport, ventilation, pumping, crushing, and processing.

Possible applications include:

• Ore conveyors
• Coal conveyors
• Crushers
• Mine ventilation
• Dewatering pumps
• Material handling
• Processing equipment
• Large fans
• Hoisting-related machinery

The 920 A configuration provides substantial current capacity for large motors.

However, mining applications require careful consideration of dust, ambient temperature, altitude, vibration, enclosure protection, grounding, cable installation, and cooling.

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13. Cement and Aggregate Applications

Cement plants can contain many large motors operating for long periods.

Potential applications include:

• Crushers
• Conveyors
• Large process fans
• Blowers
• Pumps
• Feeders
• Material-handling systems
• Dust-collection systems
• Process machinery

The ability to control motor speed can provide more flexible process operation than fixed-speed motor systems.

Large fans, for example, can operate at different speeds according to actual airflow requirements.

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14. Large Pump Applications

The 20G1F3C920LNANNNNN can be considered for large pumping systems where the motor power and operating duty fall within the drive rating.

Typical applications include:

• Water supply
• Wastewater
• Industrial cooling water
• Process water
• Mining dewatering
• Irrigation
• Chemical circulation
• Large pumping stations

Variable-speed operation allows the pump to respond to changing process requirements.

The actual energy-saving potential depends on the pump curve, system resistance, motor efficiency, operating point, and control strategy.

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15. Large Fan and Blower Applications

Fans and blowers can consume large amounts of power when operated continuously at high speed.

A variable-frequency drive can allow the motor to operate at a speed appropriate to the actual process requirement.

Applications include:

• Mine ventilation
• Industrial ventilation
• Furnace air systems
• Cooling systems
• Dust extraction
• Process-air systems
• Large exhaust systems

This type of application can also benefit from controlled startup and stopping.

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16. Compressor Applications

Large compressors may require high motor current and substantial starting torque.

A PowerFlex 755 drive can be considered when the compressor and motor characteristics are compatible with variable-speed operation.

Important compressor-selection factors include:

• Compressor type
• Motor rated current
• Starting torque
• Minimum speed
• Maximum speed
• Acceleration time
• Cooling
• Process pressure
• Load profile
• Bypass requirements
• Braking requirements

The drive should be selected according to the actual compressor duty rather than only the compressor nameplate power.

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17. Material Handling

High-power material-handling systems often require precise control over motor acceleration and speed.

Possible applications include:

• Bulk-material handling
• Loading systems
• Unloading systems
• Transfer conveyors
• Industrial transport
• Storage systems
• Production material handling

Controlled motor speed can help reduce mechanical shock and improve coordination between different machine sections.

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18. Steel and Metal Processing

Large steel and metal-processing facilities use high-power motors for many different processes.

Potential applications include:

• Large fans
• Cooling systems
• Pumps
• Conveyors
• Material handling
• Processing machinery
• Auxiliary systems

The drive can provide variable speed and controlled motor operation within the overall plant automation architecture.

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19. Product Advantages

19.1 High Current Capacity

The most obvious characteristic of the 20G1F3C920LNANNNNN is its 920 A current class.

This places it above the 650 A, 750 A, and 770 A configurations within the same general 400 V PowerFlex range.

It is therefore intended for very large industrial motors.

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19.2 High Motor Power Capability

The 400 V / 920 A configuration provides approximately:

• 560 kW light duty
• 500 kW normal duty
• 400 kW heavy duty

This gives the drive considerable flexibility across different industrial load profiles. 

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19.3 Controlled Acceleration

A large motor can produce substantial mechanical shock when started directly.

The VFD allows the motor to accelerate according to a programmed ramp.

This can reduce stress on:

• Gearboxes
• Couplings
• Shafts
• Conveyor belts
• Bearings
• Mechanical structures

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19.4 Controlled Deceleration

Stopping a large rotating load can be just as demanding as starting it.

The drive allows the deceleration profile to be controlled.

This can provide smoother machine operation and can reduce sudden mechanical loading.

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19.5 Flexible Speed Control

The motor does not have to run continuously at maximum speed.

Speed can be adjusted according to the process.

This is particularly useful for:

• Pumps
• Fans
• Blowers
• Conveyors
• Process machinery

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19.6 Large-Motor Compatibility

The 920 A configuration is intended for motors much larger than those normally connected to compact VFD products.

This makes the drive useful in large production facilities where motor power can reach several hundred kilowatts.

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19.7 Automation Integration

The PowerFlex 755 platform is intended to operate within larger industrial automation systems.

This allows drive operation to be coordinated with PLCs, HMIs, process-control systems, and other automation equipment.

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19.8 Diagnostic Functions

Industrial drives can provide useful information for troubleshooting and maintenance.

Depending on configuration, this can include:

• Drive status
• Fault information
• Warning conditions
• Motor current
• Motor speed
• Temperature-related information
• Communication status
• Operating conditions

This can make maintenance more efficient than troubleshooting a simple motor starter.

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20. Regenerative Energy Considerations

Large rotating machines can store substantial mechanical energy.

Examples include:

• Large fans
• Long conveyors
• High-inertia process machines
• Centrifugal equipment
• Hoisting machinery

When these machines decelerate, stored mechanical energy can flow back toward the drive.

Depending on the complete drive architecture, braking or regenerative solutions may be required.

The exact regenerative arrangement should therefore be checked against the complete catalog configuration and application requirements.

A 920 A drive should not be assumed to have the same braking configuration as another 920 A catalog variant.

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21. Harmonic Considerations

At this power level, harmonic performance can become an important part of electrical-system design.

A 920 A drive can represent a substantial nonlinear load within an industrial facility.

Engineers may therefore need to evaluate:

• Transformer impedance
• Input reactors
• Harmonic filters
• Power factor
• Utility requirements
• Other nonlinear loads
• Total harmonic distortion
• Generator compatibility where applicable

The exact harmonic behavior depends on the drive configuration and the surrounding electrical system.

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22. Motor Compatibility

Before using the 20G1F3C920LNANNNNN, the motor nameplate and application characteristics should be checked.

Motor Parameter	Required Consideration
Motor Voltage	Must match the drive/application
Motor Current	Must remain within the applicable duty rating
Motor Power	Must fit the selected duty classification
Motor Frequency	Must match the control system
Motor Speed	Required for setup and control
Motor Type	Must be compatible with selected control method
Motor Insulation	Should be suitable for VFD operation
Encoder	Required where feedback control is needed
Motor Cable	Length and construction must be considered
Starting Torque	Important for high-inertia machinery
Load Inertia	Important for acceleration/deceleration
Duty Cycle	Critical for final sizing
Ambient Temperature	Must be considered
Braking	Must be evaluated where frequent stopping occurs

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23. Installation Considerations

Because the model is a high-power Frame 9 drive, installation requires more planning than a small VFD installation.

Electrical Installation

The electrical system should be checked for:

• Input voltage
• Phase configuration
• Circuit protection
• Grounding
• Short-circuit capability
• Conductor size
• Motor cable size
• Cable routing
• Control wiring
• Communication wiring

Mechanical Installation

The mechanical design should include:

• Floor loading
• Mounting arrangement
• Cabinet dimensions
• Ventilation
• Service clearance
• Door access
• Cable-entry space
• Lifting points
• Maintenance access

Environmental Installation

The following conditions should also be considered:

• Ambient temperature
• Humidity
• Dust
• Corrosive atmosphere
• Altitude
• Vibration
• Airflow

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24. Maintenance

A high-power drive should be included in the plant’s preventive-maintenance program.

Regular inspection can include:

• Cooling fans
• Air passages
• Cabinet ventilation
• Electrical terminals
• Signs of overheating
• Dust accumulation
• Unusual noise
• Unusual vibration
• Fault history
• Motor current
• Communication status
• Drive temperature

The maintenance frequency should reflect the actual environment.

A drive installed in a clean electrical room can have very different maintenance requirements from a drive installed in a dusty mining, cement, or aggregate facility.

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25. Product Lifecycle and Replacement Planning

PowerFlex 755 products are now primarily encountered in existing industrial installations and replacement/maintenance projects.

This makes lifecycle planning particularly important for users operating older equipment.

When an installed drive becomes difficult to maintain, a replacement project may involve more than changing the main power unit.

The engineer may need to review:

• Physical dimensions
• Mounting arrangement
• Power connections
• Control wiring
• Communication
• Feedback
• HIM
• Firmware
• Motor parameters
• Braking
• Safety functions
• Harmonic requirements
• Cooling

The complete catalog number should therefore be recorded before a replacement is selected.

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26. Five Related Models in the Same Series

The following models are closely related PowerFlex 755 configurations and are useful when comparing current ratings, frame sizes, and application capacity.

Model	Series	Voltage Class	Current Class	Approx. Normal Duty	Approx. Heavy Duty	Frame	Cooling	Dimensions	Weight (kg)
20G1F3C750LNANNNNN	PowerFlex 755	400 V AC	750 A	Approx. 400 kW	Approx. 315–355 kW class	8	Air	Configuration dependent	Configuration dependent
20G1F3C770LNANNNNN	PowerFlex 755	400 V AC	770 A	Approx. 400 kW	Approx. 355 kW	8	Air	Configuration dependent	Configuration dependent
20G1F3C920LNANNNNN	PowerFlex 755	400 V AC	920 A	Approx. 500 kW	Approx. 400 kW	9	Air	Configuration dependent	Configuration dependent
20G1F3C920LNDNNNNN	PowerFlex 755	400 V AC	920 A	Approx. 500 kW	Approx. 400 kW	9	Air	Configuration dependent	Configuration dependent
20G1F3C1K0LNANNNNN	PowerFlex 755	400 V AC	1040 A class	Approx. 560 kW	Approx. 450–500 kW class	9	Air	Configuration dependent	Configuration dependent

The 750 A, 770 A, 920 A and 1K0 configurations appear in the PowerFlex 755 product/rating family, with the 920 A configuration associated with Frame 9. 

The 20G1F3C920LNANNNNN and 20G1F3C920LNDNNNNN are particularly close catalog variants, but the different suffixes indicate that the complete configuration should be checked before considering one a direct replacement for the other.

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27. Five Related High-Power Models

For a broader comparison, the following PowerFlex 755 models can be considered around the same high-power range.

Model	Series	Input Class	Current	Normal-Duty Class	Frame	Cooling	Application	Dimensions	Weight (kg)
20G1F3C650LNDNNNNN	PowerFlex 755	400 V AC	650 A	Approx. 355 kW	8	Air	Large industrial motors	Configuration dependent	Configuration dependent
20G1F3C750LNDNNNNN	PowerFlex 755	400 V AC	750 A	Approx. 400 kW	8	Air	Large conveyors / pumps / fans	Configuration dependent	Configuration dependent
20G1F3C770LNDNNNNN	PowerFlex 755	400 V AC	770 A	Approx. 400 kW	8	Air	High-power industrial machinery	Configuration dependent	Configuration dependent
20G1F3C920LNDNNNNN	PowerFlex 755	400 V AC	920 A	Approx. 500 kW	9	Air	Very large industrial motors	Configuration dependent	Configuration dependent
20G1F3D1K0LNDNNNNN	PowerFlex 755	400 V class	1040 A class	Approx. 560 kW	9	Air	Very high-power industrial systems	Configuration dependent	Configuration dependent

These catalog numbers are all within the broader high-power PowerFlex 755 range and are useful when selecting a drive according to motor current and duty requirements. Product listings also identify the 920 A and neighboring 1K0 configurations as PowerFlex 755 AC drives. 

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28. Five Popular Allen-Bradley Models for Comparison

Model	Series	Voltage Class	Current / Capacity	Approx. Application Level	Frame	Cooling	Typical Application	Dimensions	Weight (kg)
20F1AGC302JN0NNNNN	PowerFlex 753	400/480 V class	302 A class	High-power industrial	Frame dependent	Air	Pumps, fans, conveyors	Configuration dependent	Configuration dependent
20G1F3C650LNDNNNNN	PowerFlex 755	400 V AC	650 A	Approx. 355 kW ND	8	Air	Large industrial machinery	Configuration dependent	Configuration dependent
20G1F3C750LNDNNNNN	PowerFlex 755	400 V AC	750 A	Approx. 400 kW ND	8	Air	Large conveyors / pumps	Configuration dependent	Configuration dependent
20G1F3C770LNDNNNNN	PowerFlex 755	400 V AC	770 A	Approx. 400 kW ND	8	Air	High-power machinery	Configuration dependent	Configuration dependent
20G1F3C920LNANNNNN	PowerFlex 755	400 V AC	920 A	Approx. 500 kW ND	9	Air	Very high-power industrial systems	Configuration dependent	Configuration dependent

The PowerFlex 753 and PowerFlex 755 families contain a broad range of current ratings, while the 20G1F3C920 configuration sits toward the high-current end of the PowerFlex 755 range. Related product listings also show numerous 755 configurations from lower current levels through 920 A and above. 

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29. Comparison With the 770 A Version

The 770 A and 920 A versions are particularly useful to compare because they are close in the same high-power product family.

Feature	20G1F3C770LNANNNNN	20G1F3C920LNANNNNN
Series	PowerFlex 755	PowerFlex 755
Input Voltage Class	400 V AC	400 V AC
Current Class	770 A	920 A
Normal Duty	Approx. 400 kW	Approx. 500 kW
Heavy Duty	Approx. 355 kW	Approx. 400 kW
Light Duty	Approx. 450 kW	Approx. 560 kW
Frame	8	9
Cooling	Air	Air
Physical Scale	Large	Larger
Dimensions	Configuration dependent	Configuration dependent
Weight (kg)	Configuration dependent	Configuration dependent

The 920 A model provides a higher current and power class than the 770 A version and moves from Frame 8 to Frame 9. The published PowerFlex tables show 770 A at 400 kW normal duty and 920 A at 500 kW normal duty for the 400 V family. 

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30. Comparison With the 750 A Version

Feature	20G1F3C750LNANNNNN	20G1F3C920LNANNNNN
Series	PowerFlex 755	PowerFlex 755
Voltage	400 V AC	400 V AC
Current	750 A	920 A
Normal Duty	Approx. 400 kW	Approx. 500 kW
Heavy Duty	Approx. 355 kW	Approx. 400 kW
Frame	8	9
Cooling	Air	Air
Application Level	High power	Very high power
Dimensions	Configuration dependent	Configuration dependent
Weight (kg)	Configuration dependent	Configuration dependent

The 920 A model is a substantially larger current class than the 750 A model and is intended for applications requiring additional motor current capacity.

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31. Advantages for Conveyor Applications

A high-power drive can improve conveyor operation in several ways.

The motor can be accelerated gradually rather than being subjected to an abrupt full-speed start.

This can reduce mechanical shock on the conveyor system.

Potential benefits include:

• Reduced belt stress
• Reduced gearbox shock
• Reduced coupling stress
• Smoother startup
• Better speed coordination
• Controlled stopping
• Improved process flexibility

For long conveyors, acceleration and deceleration profiles can be particularly important because the mechanical system can have very high inertia.

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32. Advantages for Pump Applications

Pump systems often operate under changing process demand.

A variable-frequency drive allows the motor speed to change rather than forcing the pump to operate continuously at maximum speed.

This can provide:

• Flexible flow control
• Pressure control
• Smooth starting
• Smooth stopping
• Reduced mechanical shock
• Potential energy savings

The actual energy performance depends on the pump and hydraulic system.

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33. Advantages for Fan Applications

Large fans can also benefit from variable-speed control.

The fan can operate at a speed appropriate to the actual airflow requirement.

This can be useful in:

• Mine ventilation
• Industrial ventilation
• Cooling systems
• Furnace applications
• Dust collection
• Process-air systems

The drive can also provide controlled acceleration, reducing the mechanical stress associated with starting a large fan rotor.

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34. Advantages for Mining Applications

Mining equipment can have demanding operating conditions.

A high-power drive such as the 20G1F3C920LNANNNNN can provide the current capacity needed for large motors while allowing the motor to be integrated into an automated control system.

Potential benefits include:

• Controlled conveyor acceleration
• Variable fan speed
• Pump-speed control
• Process coordination
• Controlled stopping
• Drive diagnostics
• Automated operation

Environmental factors remain extremely important, particularly dust, temperature, altitude, vibration, and cooling.

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35. Advantages for Cement Plants

Cement plants often operate continuously and contain many high-power rotating machines.

The drive can be applied to:

• Large fans
• Conveyors
• Crushers
• Pumps
• Blowers
• Material-handling equipment
• Process machinery

The ability to control motor speed can make the production system more flexible.

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36. Important Selection Factors

Before selecting the 20G1F3C920LNANNNNN, the following information should be reviewed.

Selection Factor	Importance
Motor Rated Current	Extremely important
Motor Voltage	Extremely important
Motor Power	Important
Duty Classification	Extremely important
Starting Torque	Important
Load Inertia	Important
Acceleration Time	Important
Deceleration Time	Important
Braking Requirement	Application dependent
Regeneration	Application dependent
Ambient Temperature	Important
Altitude	Important
Cooling	Extremely important
Harmonics	Important
Communication	Important
Feedback	Application dependent
Enclosure	Important
Mechanical Dimensions	Extremely important
Weight	Important
Floor Loading	Important
Service Clearance	Important
Spare Strategy	Important for critical equipment

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37. Final Detailed Parameter Table

Category	Specification
Model	20G1F3C920LNANNNNN
Brand	Allen-Bradley
Product Family	PowerFlex
Product Series	PowerFlex 755
Product Type	High-power AC variable frequency drive
Configuration	Air-cooled packaged drive
Input Voltage	400 V AC class
Input Phase	Three-phase
Current Rating	920 A
Frame	Frame 9
Light-Duty Rating	Approx. 560 kW
Normal-Duty Rating	Approx. 500 kW
Heavy-Duty Rating	Approx. 400 kW
Cooling	Air cooled
Output	Variable-frequency three-phase AC
Motor Control	Programmable
Speed Control	Yes
Torque Control	Configuration dependent
Acceleration	Programmable
Deceleration	Programmable
Feedback	Configuration dependent
Communication	Configuration dependent
HIM	Configuration dependent
Braking	Configuration dependent
Regenerative Operation	Configuration dependent
Harmonic Solution	Configuration dependent
Installation	Large industrial / floor-mounted
Height	Configuration dependent
Width	Configuration dependent
Depth	Configuration dependent
Dimensions H × W × D	Verify exact mechanical configuration
Net Weight	Configuration dependent
Weight (kg)	Verify exact packaged-drive data
Typical Applications	Conveyors, pumps, fans, blowers, compressors, mining, cement, material handling
Industrial Environment	Application dependent
Service Requirement	Industrial preventive maintenance
Product Family Position	High-power PowerFlex 755 configuration

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38. Overall Product Summary

The Allen-Bradley 20G1F3C920LNANNNNN is a high-power PowerFlex 755 AC variable frequency drive designed for large industrial motor applications.

Its most important characteristics are its 400 V AC class, three-phase input, 920 A current rating, Frame 9 construction, air-cooled design, and high motor-power capability.

For the applicable 400 V rating family, the drive is associated with approximately 560 kW light duty, 500 kW normal duty, and 400 kW heavy duty. 

This makes the model particularly suitable for applications involving several-hundred-kilowatt motors.

Typical applications include large conveyors, mining equipment, cement machinery, pumps, fans, blowers, compressors, material-handling systems, water systems, and other large rotating machines.

The move to Frame 9 is also significant.

Compared with 650 A, 750 A and 770 A Frame 8 configurations, the 920 A version provides additional current and power capacity and requires a larger mechanical installation arrangement.

The drive is therefore best suited to facilities where the motor is a major part of the production process and where precise, controlled motor operation is important.

For conveyor systems, it can provide controlled acceleration and deceleration.

For pumps, it can provide variable-speed process control.

For fans, it can adjust airflow according to operating demand.

For mining and cement equipment, it can provide the high current capacity required by large motors.

For material-handling systems, it can provide controlled movement and speed regulation.

The large current rating also means that the surrounding electrical system must be designed carefully.

Input protection, grounding, conductor sizing, transformer capacity, harmonic performance, motor-cable selection, cooling, and short-circuit considerations should all be evaluated before installation.

The mechanical side is equally important.

Because the drive is a Frame 9 high-power configuration, the actual dimensions and weight should be taken from the complete mechanical configuration rather than estimated from a smaller Frame 8 product.

For purchasing, replacement, or maintenance work, the complete catalog number 20G1F3C920LNANNNNN should be treated as the reference identifier.

The 920 A rating by itself is not enough to determine whether a particular motor or application is suitable.

The motor nameplate current, motor voltage, duty cycle, acceleration requirements, load inertia, environmental conditions, braking requirements, communication system, feedback requirements, and mechanical installation all need to be considered together.

In practical terms, the 20G1F3C920LNANNNNN represents a very high-power PowerFlex 755 drive for large 400 V industrial motor systems, positioned above the 750 A and 770 A Frame 8 configurations and within the Frame 9 high-current class.

Its combination of high current capacity, large motor capability, programmable speed control, controlled acceleration and deceleration, industrial automation integration, and flexible application configuration makes it suitable for demanding large-scale industrial machinery.